need help with material nodes- accidentally tampered with them
Here is a much simpler node set up for you. 

Essentially all you are seeing is the noise texture. You dont need all that other stuff. 

Also the sockets have to plug into the same color (you can break this rule sometimes, but not in your case.)

 



You can use something other than a noise texture to have a different type of bump.



Or even better just use this set up since you want shine and bump.